无人机的核心不是飞得多高,而是用得多好。
If one only wished to be happy, this could be easily accomplished; but we wish to be happier than other people, and this is always difficult, for we believe others to be happier than they are.
要写一封好的情书,你应该在不知道要说什么的情况下开始写,然后在不知道自己写了什么的情况下结束。
The world is changing very fast. Big will not beat small anymore. It will be the fast beating the slow.